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  1. #27
    Join Date
    Sep 2002
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    If the TAN number comes back within reason then it was heat. Mineral oil is a hydrocarbon and High temps decompose the carbon out as, essentially; soot.

    Pull a head and see what the valves look like.

    If you went back with a POE compressor you should Treat It Like A Burn-Out and add a suction filter can to keep all the crap and yak out of the new compressor oil.

    How were the start-up numbers?

    Especially suction and discharge superheats?

    What is the application?

    High compression ratio by any chance?

    PHM
    -----------


    Quote Originally Posted by dave1234 View Post
    Changed a 6D3PR35 other day and while the failure was top end damage- no pump- most likely due to flooded starts as cch was not operating I noted in the sight glass how discolored the oil was. Oh was I right. What would cause the oil to turn black like that? I've seen the dingy yellow but never pitch black even with sever motor burn. This wasn't even a motor burn and I realize no pump=no motor cooling=oil overheating but the oil failure switch or MP would shut it off. This was my first time at this place so I cannot speak of its history. See pic- oil blacker than the cap. Attachment 802884
    Was R22/min oil AC


    Sent from my iPhone using Tapatalk
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  2. #28
    Join Date
    Jul 2008
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    818
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    Thread Starter
    Quote Originally Posted by pecmsg View Post
    Ok so that explains why I've only seen (on copes) with the 3D's the solenoid is DE-energized to unload- unlike other copes that is.


    Sent from my iPhone using Tapatalk
    "It's just like it doesn't work. I mean it seems to be ok now, but it usually like never works"

    "Never an always and always a maybe"

  3. #29
    Join Date
    Sep 2002
    Posts
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    Ever try R-453 ?

    PHM
    -------



    Quote Originally Posted by dave1234 View Post
    What's the alternative? All the other 22 replacements are just as goofy- some more so than others.


    Sent from my iPhone using Tapatalk
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  4. #30
    Join Date
    Jul 2008
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    818
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    Thread Starter
    Never heard of it actually. I hear guys using that MO99 (forget R number) a lot in places they shouldn't as it came right from chemours rep that it was only for under 5 tons


    Sent from my iPhone using Tapatalk
    "It's just like it doesn't work. I mean it seems to be ok now, but it usually like never works"

    "Never an always and always a maybe"

  5. #31
    Join Date
    Aug 2002
    Location
    Southold, NY
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    16,107
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    Quote Originally Posted by dave1234 View Post
    Never heard of it actually. I hear guys using that MO99 (forget R number) a lot in places they shouldn't as it came right from chemours rep that it was only for under 5 tons


    Sent from my iPhone using Tapatalk
    MO-99 is a high temp R-22 replacement. Supposedly no oil checked needed.
    I use it on A/C

    Comp Tons doesn’t matter.

  6. #32
    Join Date
    Jul 2008
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    Thread Starter
    Ive never used I just know the Chemours guy said it was for under 5 tons?
    "It's just like it doesn't work. I mean it seems to be ok now, but it usually like never works"

    "Never an always and always a maybe"

  7. #33
    Join Date
    Jul 2008
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    818
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    Thread Starter
    I stressed the urgency to the people but facilities leads/head maintenance/bean counter/janitors don't quite get it. But yes piping in a suction shell along with repeat visits for cleanup oil/filter drier changes was all part of it
    "It's just like it doesn't work. I mean it seems to be ok now, but it usually like never works"

    "Never an always and always a maybe"

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